Some people prefer more freedom and transparency than Windows gives. Some like to be able to tinker with their OS. There's also affordability and lower resource usage.
In my case, along with some of what's listed above, the tools and such that I work with are actually geared more towards Linux use anyway, so that's just 1 more thing that pulls me in that direction.
Linux definitely isn't a one-size-fits-all environment, especially with the number of Linux distros and DE choices out there.
So, like most things, it comes down to personal preferences and requirements for the most part.
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